Not much to see here, don't hold your breath until a good ol' README comes up! ;-)
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$ cd <somewhere>
$ git clone git://github.com/exalted/PTShowcaseViewController.git PTShowcaseViewController-exalted
$ cd PTShowcaseViewController-exalted/
$ git submodule init
$ git submodule update
$ open Examples/ShowcaseDemo/ShowcaseDemo.xcodeproj